This is a survival radio that transmits on either 121.5 or 243 MHz. It's KoreanConflict, Vietnam Era vintage and uses vacuum tubes.
The thing that's most noticable is that it weighs a lot (2lbs 13 oz without the battery or battery cable).
Movie credits: Ice Station Zebra, The Bridges at Toko-Ri, Bombers B-52, Flight from Ashiya, Battle Taxi
This is a Hoffman Radio Corp. RT-159A/URC-4 s/n: 31263
Both V3 & V4 are USAF 6147 pencil tubes.
RT-159A - the doubler tubes V3 & V4 changed from 5851 to USAF 6147 & wiring, resistor, bias and capacitor changes
RT-159B - JAN 2E32 used for V4 after s/n 16,000 CK6397 & JAN5678 used for V3 & V4.
BA-1264/U Mercury Battery
B+: 136/115 (replace at 120)
A: 1.3/1.18 (replace at 1.2)
Manual 5 Oct 1950 revised 5 May 1960
The Y1 crystal in the only crystal in the radio. It's in an axial lead machined cylindrical package and snaps into place just behind V1The MAY-1 UHF radio set come with the CY-591/U Crystal Case filled with CR-9/U (? is that the correct crystal designation) crystals that have this look and feel.
Marking engraved on crystal:
CR-24/U CAIJ 30.375 MC
Note: 4 * 30.375 = 121.5 MC
Note: 2* 121.5 = 243.0 MC
Examples of the CR-24/U crystal package:
2 each CZX 28.24000 MC
2 each CCSO 32.91250 MC
What do the letters CAIJ CZX and CCSO mean? Let me know.
|Fig 7 Schematic RT-159A
||Fig 8 Inside V1 at top
||Fig 9 Y1 Crystal
V1 in front of Y1, then V2, then V3 & V4 as a pair.
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